A method for enabling data set changes to be reverted to a prior point in time or state is disclosed. In one embodiment, such a method includes providing a data set comprising one or more data elements and a specified number of generations of the data elements. In certain embodiments, the data set is a partitioned data set extended (PDSE) data set, and the data elements are “members” within the PDSE data set. The method further includes tracking changes made by a job to data elements of the data set. The method further references, in a data structure (also referred to herein as a “cluster”) associated with the job, previous generations of the data elements changed by the job. In certain embodiments, the data structure is stored in the data set. A corresponding system and computer program product are also disclosed.
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2. The method of claim 1, wherein the data elements are members within a partitioned data set extended (PDSE) data set.
3. The method of claim 1, further comprising retiring the job cluster when at least one generation referenced by the job cluster is permanently deleted from the data set.
4. The method of claim 1, further comprising referencing the job cluster in a log structure outside of the data set.
5. The method of claim 4, further comprising removing the job cluster from the log structure when the job cluster is invalid.
7. The computer program product of claim 6, wherein the data elements are members within a partitioned data set extended (PDSE) data set.
8. The computer program product of claim 6, further comprising computer-usable program code to invalidate the job cluster when at least one generation referenced by the job cluster is permanently deleted from the data set.
9. The computer program product of claim 6, further comprising computer-usable program code to reference the job cluster in a log structure outside of the data set.
10. The computer program product of claim 9, further comprising computer-usable program code to remove the job cluster from the log structure when the job cluster is invalid.
12. The system of claim 11, wherein the data elements are members within a partitioned data set extended (PDSE) data set.
13. The system of claim 11, wherein the instructions further cause the at least one processor to invalidate the job cluster when at least one generation referenced by the job cluster is permanently deleted from the data set.
14. The system of claim 11, wherein the instructions further cause the at least one processor to reference the job cluster in a log structure outside of the data set, and remove the job cluster from the log structure when the job cluster is invalid.
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August 20, 2015
January 24, 2023
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